It's really not that hard to find someone to go to check a address, redditors do this all the time. It should be expected as basic journalism, especially with high claims.
Check an address and interview anyone resident there in a way that gets useful answers to the questions at hand.
In this instance it was a bust because no one useful was there. But if the mastermind behind the whole operation was there you’d want a professional to ask them questions. Because once they know they’ve been rumbled they’re probably going to disappear.
Why does every discussion have to wind up with a digression thread about how "real" or, even worse, "basic" journalism is something from a sepia-tinged golden age of muckrakers getting blitzed with Dorothy Parker? People are trying. There's lots of shıt masquerading as journalism, but this ain't it.